prove that [a+b , b+c , c+a] = 2(abc)
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a+b,b+c,c+a
(Add all the three)
A+b+b+c+c+a= 2a+2b+2c= 2(a+b+c)
(Add all the three)
A+b+b+c+c+a= 2a+2b+2c= 2(a+b+c)
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puri trh. solve. kijiye
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